I don't want to sound like the negative one although i will share my experience with using a folding ladder, I've been in construction for more than 35 years, In all this time I work from scaffold and ladders, and have have extension ladders ranging size from 8 ft. to 40 ft. and all size in between,
I had a homeowner who needed the exterior trim ( brick molding ) replaced around a window, the window was about 9 ft. from ground level,.... Now I had several of my ladders with me that I could have reached this window with, The home owner told me he had his ladder readily available in the garage, and told me would be no need for me to get mine from the truck, when he returned with his ladder it was the folding kind, I told him I don't use these type ladders and I would just go get one from my truck, but he again said Oh! I assure you this ladder is safe and he has used it many times with no problem, OK I said, I'll try it but also asked being he is more familiar how to lock it all in place for him to do so, He set it up and I mad sure it was on good footings, I then started up the ladder and come to the first joint and I heard a click and stopped, he said that was typical noise, I then went up one more rung and the darn thing collapsed under me, luckily I wasn't very high and I land on my feet, needless to say the homeowner was quit embarrassed as I asked him to get that ladder out of there while I went for my trustworthy ladder,

never again have I gotten up on one of these type ladders, Folks it only takes but 1 time to critically injure yourself, I was lucky that wasn't my time, However since that incident just a few years ago while up on a actual extension ladder extended to about 20 ft inside a house trimming out a upper window in a foyer the ladder slipped on some MDF dust on the floor and I road the ladder down when suddenly on the way down my left foot fell between a rung and when the ladder became parallel on the floor my foot was entrapped under the ladder rung and my full body weight on top of the ladder, and yup! broke my foot in 3 places, So I guess my point is you can be injured from any ladder, but why increase the chances using one that is not actually a extension ladder?, Sure if you need a
STEP ladder that can also configure into different Position or if used on a stare-way this might could be handy, but if you need to reach the eves of your house or need to get up on the roof, simply Buy a good quality 16 ft. extension ladder and keep the folding ladder as a simple step ladder:thumbsup: